Wood preservation ajtd means eor effecting the same



GEORGE PFEIFFER, JR., OF CAMDEN', NEW JERSEY.

WOOD PRESERVATION AND MEANS FOR EFFECTING THE SAME.

Specification of Letters Patent. lllgdjentegd Feb. 22, 1921.

Application led July 25, 1919. Serial No. 313,339.

To all whom t may concern.'

Be it known that I, GEORGE Prnrrrnn, J r., a citizen of the UnitedStates, residing in Camden, New Jersey, have invented certainImprovements in Wood Preservation and Means for Eifecting the Same, ofwhich the following is a specification.

My invention relates to the treatment of wooden poles or posts such, forinstance, as telegraph and telephone poles, fence posts and the like, insuch a manner as to preserve them from decay, especially at the surfaceof the ground in which they are set and where they are subjected toalternate wetting and drying as the weather changes. My invention isespecially directed to that method of preservation in which thepreservative fluid is stored in a chamber in the center of the post andfrom this reservoir permeates the pores of the wood and linds its way toall parts of the post requiring treatment.

The object of my invention is to facilitate such permeation and therebylessen the time reouired for effective treatment.

lfn the accompanying drawing- Figure 1 represents the lower portion of apole partly in elevation and partly in longitudinal section and equippedfor preservative treatment in accordance with my invention, and

Fig. 2 is a similar view illustrating the application of my invention toa pole which had been previously set.

The pole 1, shown in Fig. 1, has in its lower portion a central bore 2extending from the bottom of the pole up into the same as far as thetreatment is intended to eX tend, the lower end of this bore beingclosed by a plug 3 and its upper end having a lateral branch 4 whoseouter end communicates with a short pipe 5, with elbow 6, this pipeforming an extension of the branch 4 and being closed at its outer endby a plug 7 ot electrical insulating` material.

Extending throughout the bore of the plug are two runs 8 and 9 of anelectrical conductor, these runs being connected to a resistance body 14in the chamber 2, passing through fluid-tight openings in the plug 7,and being connected, respectively, to the positive and negative poles ofan electric generator of any desired character.

From the elbow 6 extends upwardly a pipe 10, communicating with areservoir 11 containing the desired preservative fluid and mounted atvany appropriate height on the pole 1 to impart to the preservative fluidthe head necessary to maintain it under pressure in the bore 2, or saidpipe 1() may have a branch 12 for connection with a pump for impartingpressure to said fluid, the pipe 10 in this case being provided with astop or check valve 13 located below the reservoir.

I have found that the preservative fluid will permeate the pores of thewood more quickly when heated, and any required degree oi heat can beimparted to the preservative in the chamber 2 throughout any desiredlength of time by passing an electric current through the resistancebody 14 contained in the preservative fluid in said chamber.

By providing the opposite ends of the chamber 2 with detachable plugsthe introduction or removal of the electrical conductors can be readilyeliected, and this may be accomplished even without the bottom plug 3,although the use of both plugs is preferred.

In applying the invention to poles which have already been set in theground, the chamber 2 may extend diagonally downward and inward from theoutside of the pole, as shown in Fig. 2, in order that it may be readilyformed without disturbing the pole.

lf claim:

1. The combination of a pole having a chamber therein. means forsupplying a preservative fluid to said chamber, and an electricalresistance body contained in said chamber.

2, The combination of a pole having in its lower portion a centralchamber, with lateral branch at its upper end, an insulating plugclosing the outer end of said branch, means for supplying said chamberwith preservative luid, and an electrical resistance body contained insaid chamber and with its supply wires passing out through openings insaid insulating plug.

3. The combination of a pole having a chamber therein for holding apreservative Huid, said chamber having a removable plug at its lowerend, means for supplying said chamber with preservative fluid, and anelectrical resistance body contained in said chamber and with, itssupply wires passing out through the upper end ci the same.

L The combination of a pole having'therebranch a reservoir Jforsupplying preservan a chamber for holding a preservative tive fluid tosaid pipe, and between said Huid, said chamber havingat its upper endbranch and reservoir a valve i'or preventing 10 a projecting' pipe Withelbow therein, a upward flow through the pipe. 5 pipe extendingupwardlyfrom saidelbow, In testimony whereof I have signed my said pipe having albranch therein through name to this specification. which uid'maybepumped and above said GEORGE PFEIFFER, JR.

